Thanks for the reply. I realize that at 90F I would need to pull about 28.5 inches of vacuum (about 35,000 microns) to boil. With the leak in the system, it's not possible. My main question is when the clutch engages, shouldn't the high side go up and the low side go down? I have no difference in the two sides with the compressor running. Even with an undercharge, shouldn't it move refrigerant?